<template>
    <div class="component-upload-image">
        <el-upload
                multiple
                :action="uploadImgUrl"
                :data="dataObj"
                list-type="picture-card"
                :on-success="handleUploadSuccess"
                :before-upload="handleBeforeUpload"
                :limit="limit"
                :on-error="handleUploadError"
                :on-exceed="handleExceed"
                ref="imageUpload"
                :before-remove="handleDelete"
                :show-file-list="true"
                :headers="headers"
                :file-list="fileList"
                :on-preview="handlePictureCardPreview"
                :class="{ hide: fileList.length >= limit }"
        >
            <el-icon class="avatar-uploader-icon">
                <plus/>
            </el-icon>
        </el-upload>
        <!-- 上传提示 -->
        <div class="el-upload__tip" v-if="showTip">
            请上传
            <template v-if="fileSize">
                大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
            </template>
            <template v-if="fileType">
                格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
            </template>
            的文件
        </div>

        <el-dialog
                v-model="dialogVisible"
                title="预览"
                width="800px"
                append-to-body
        >
            <img
                    :src="dialogImageUrl"
                    style="display: block; max-width: 100%; margin: 0 auto"
            />
        </el-dialog>
    </div>
</template>

<script setup>
import {getToken} from "@/utils/auth";
import ossApi from '@/api/thirdParty/oss'
import uuidApi from '@/utils/uuid'

const props = defineProps({
    modelValue: [String, Object, Array],
    // 图片数量限制
    limit: {
        type: Number,
        default: 5,
    },
    // 大小限制(MB)
    fileSize: {
        type: Number,
        default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
        type: Array,
        default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
        type: Boolean,
        default: true
    },
});

const {proxy} = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_OSS_PATH); // 上传的图片服务器地址
const headers = ref({Authorization: "Bearer " + getToken()});
const fileList = ref([]);
const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
);
let dataObj = {
    policy: '',
    signature: '',
    key: '',
    OSSAccessKeyId: '',
    dir: '',
    host: ''
};

watch(() => props.modelValue, val => {
    if (val) {
        // 首先将值转为数组
        const list = Array.isArray(val) ? val : props.modelValue.split(",");
        console.log("list:" + JSON.stringify(list));
        // 然后将数组转为对象数组
        fileList.value = list.map(item => {
            if (typeof item === "string") {
                item = {url: item};
            }
            return item;
        });
        console.log("fileList:" + JSON.stringify(fileList));
    } else {
        fileList.value = [];
        return [];
    }
}, {deep: true, immediate: true});

// 上传前loading加载
function handleBeforeUpload(file) {
    let isImg = false;
    if (props.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
            fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = props.fileType.some(type => {
            if (file.type.indexOf(type) > -1) return true;
            if (fileExtension && fileExtension.indexOf(type) > -1) return true;
            return false;
        });
    } else {
        isImg = file.type.indexOf("image") > -1;
    }
    if (!isImg) {
        proxy.$modal.msgError(
            `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
        );
        return false;
    }
    if (props.fileSize) {
        const isLt = file.size / 1024 / 1024 < props.fileSize;
        if (!isLt) {
            proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
            return false;
        }
    }
    //获取OSS签名
    return new Promise((resolve, reject) => {
        ossApi.getPolicy()
            .then((response) => {
                console.log('policy response:' + JSON.stringify(response))
                // debugger;
                dataObj.policy = response.data.policy
                dataObj.signature = response.data.signature
                dataObj.OSSAccessKeyId = response.data.accessId
                dataObj.key = response.data.dir + uuidApi.getUUID() + '_${filename}'
                dataObj.dir = response.data.dir
                dataObj.host = response.data.host
                console.log('获取policy成功')
                // console.log('dataObj:' + JSON.stringify(dataObj))
                // console.log("uploadImgUrl:" + import.meta.env.VITE_APP_OSS_PATH)
                proxy.$modal.loading("正在上传图片，请稍候...");
                number.value++;
                resolve(true)
            })
            .catch((err) => {
                console.log('获取policy失败')
                reject(false)
            })
    })

}

// 文件个数超出
function handleExceed() {
    proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
    console.log("handleUploadSuccess，" + JSON.stringify(res) + JSON.stringify(file))
    uploadList.value.push({
        name: file.name, url: dataObj.host +
            '/' +
            dataObj.key.replace('${filename}', file.name)
    });
    console.log("上传成功")
    uploadedSuccessfully();
}

// 删除图片
function handleDelete(file) {
    const findex = fileList.value.map(f => f.name).indexOf(file.name);
    if (findex > -1 && uploadList.value.length === number.value) {
        fileList.value.splice(findex, 1);
        let urlList = getUrlList(fileList);
        emit("update:modelValue", urlList);
        return false;
    }
}

// 上传结束处理
function uploadedSuccessfully() {
    console.log("number.value:" + number.value);
    if (number.value > 0 && uploadList.value.length === number.value) {
        //将新上传的图片添加到fileList
        for (let i = 0; i < uploadList.value.length; i++) {
            fileList.value.push(uploadList.value[i]);
        }
        //将所有图片的url拿出来，形成一个集合
        let urlList = getUrlList(fileList);
        uploadList.value = [];
        number.value = 0;
        emit("update:modelValue", urlList);
        proxy.$modal.closeLoading();
    }
}

// 上传失败
function handleUploadError() {
    proxy.$modal.msgError("上传图片失败");
    proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
    dialogImageUrl.value = file.url;
    dialogVisible.value = true;
}

function getUrlList(fileList) {
    let urlList = [];
    for (let i = 0; i < fileList.value.length; i++) {
        urlList.push(fileList.value[i].url);
    }
    return urlList;
}


</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>